package postgres

import (
	"context"
	"strings"

	"github.com/pkg/errors"

	storepb "github.com/usememos/memos/proto/gen/store"
	"github.com/usememos/memos/store"
)

func (d *DB) UpsertUserSetting(ctx context.Context, upsert *store.UserSetting) (*store.UserSetting, error) {
	stmt := `
		INSERT INTO user_setting (
			user_id, key, value
		)
		VALUES ($1, $2, $3)
		ON CONFLICT(user_id, key) DO UPDATE 
		SET value = EXCLUDED.value
	`
	if _, err := d.db.ExecContext(ctx, stmt, upsert.UserID, upsert.Key.String(), upsert.Value); err != nil {
		return nil, err
	}
	return upsert, nil
}

func (d *DB) ListUserSettings(ctx context.Context, find *store.FindUserSetting) ([]*store.UserSetting, error) {
	where, args := []string{"1 = 1"}, []any{}

	if v := find.Key; v != storepb.UserSetting_KEY_UNSPECIFIED {
		where, args = append(where, "key = "+placeholder(len(args)+1)), append(args, v.String())
	}
	if v := find.UserID; v != nil {
		where, args = append(where, "user_id = "+placeholder(len(args)+1)), append(args, *find.UserID)
	}

	query := `
		SELECT
			user_id,
		  key,
			value
		FROM user_setting
		WHERE ` + strings.Join(where, " AND ")
	rows, err := d.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	userSettingList := make([]*store.UserSetting, 0)
	for rows.Next() {
		userSetting := &store.UserSetting{}
		var keyString string
		if err := rows.Scan(
			&userSetting.UserID,
			&keyString,
			&userSetting.Value,
		); err != nil {
			return nil, err
		}
		userSetting.Key = storepb.UserSetting_Key(storepb.UserSetting_Key_value[keyString])
		userSettingList = append(userSettingList, userSetting)
	}

	if err := rows.Err(); err != nil {
		return nil, err
	}

	return userSettingList, nil
}

func (d *DB) GetUserByPATHash(ctx context.Context, tokenHash string) (*store.PATQueryResult, error) {
	// Simplified query: fetch all PERSONAL_ACCESS_TOKENS rows and search in Go
	// This matches SQLite/MySQL behavior and avoids PostgreSQL's strict JSONB errors
	query := `
		SELECT
			user_id,
			value
		FROM user_setting
		WHERE key = 'PERSONAL_ACCESS_TOKENS'
	`

	rows, err := d.db.QueryContext(ctx, query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	// Iterate through all users with PAT settings
	for rows.Next() {
		var userID int32
		var tokensJSON string

		if err := rows.Scan(&userID, &tokensJSON); err != nil {
			continue // Skip malformed rows
		}

		// Try to unmarshal - skip if invalid JSON
		patsUserSetting := &storepb.PersonalAccessTokensUserSetting{}
		if err := protojsonUnmarshaler.Unmarshal([]byte(tokensJSON), patsUserSetting); err != nil {
			continue // Skip invalid JSON
		}

		// Search for matching token hash
		for _, pat := range patsUserSetting.Tokens {
			if pat.TokenHash == tokenHash {
				return &store.PATQueryResult{
					UserID: userID,
					PAT:    pat,
				}, nil
			}
		}
	}

	if err := rows.Err(); err != nil {
		return nil, err
	}

	return nil, errors.New("PAT not found")
}
